3 Biological Molecules

Question 1

What are carbohydrates made up of?

Answer 1

Made up of small basic units called simple sugars. Formed from carbon, hydrogen and oxygen atoms. An example of a simple sugar is glucose.

Question 2

Name the chemicals that make up proteins

Answer 2

Made up of long chains of amino acids linked together. Formed from carbon, hydrogen and oxygen atoms. An example is haemoglobin.

Question 3

Name the chemicals that make up lipids

Answer 3

Made from basic units called fatty acids and glycerol. There are three fatty acids in each lipid, and they vary in different lipids. They are important in forming cell membranes and other molecules in the body, such as fats in storage cells.

Question 4

Test for starch

Answer 4

Iodine solution - brown to blue-black.

Question 5

Test for glucose

Answer 5

Benedict’s reagent - blue to brick-red

Question 6

Test for protein

Answer 6

Biuret test - blue to purple

Question 7

Test for lipids

Answer 7

Ethanol - Clear to cloudy-milky